What's Included in the Kit#


While the values of the components and the layout of the PCB won't change, they may vary in appearance (ie, changing the brand of caps, different color/silkscreen PCB, etc), so your kit's parts may look slightly different than what's pictured throughout the guide. That's just fine! Everything will work the same.

The POLY555 DIY Kit

  • Printed circuit board (PCB): 1
  • Plexiglass window pane: 1
  • Electronics components: 255 pieces total!
    • 9v snap, chips, switch: 24
    • Capacitors: 64
    • IC chip sockets: 21
    • LEDs: 3 colors, 21 total
    • Resistors: 83
    • Speaker: 1
    • Tactile switches: 20
    • Trim potentiometers: 21
  • Nuts and bolts: 12

Not Using the Kit?#

If you're going the full open-source route and gathering all the parts by yourself, head over to the POLY555 from Scratch appendix, then come back here when you're done.

What You'll Need#

You'll need the following tools to assemble your POLY555:


  • Soldering iron and solder for electronics
  • Wire stripper or cutters
  • Philips and flathead screwdrivers
  • Chromatic instrument tuner or phone app
  • Utility knife
  • School glue
  • 9v battery


  • Multimeter for debugging
  • PCB vice or “helping hands” holder
  • “Solder sucker” or desoldering braid
  • Tweezers or “dentist’s tools” for working with small components
  • Windex
  • Patience, patience, patience

Give yourself plenty of time to put this together, at least 5 hours. There are a lot of components and things to solder!

I like to spread it out throughout the day and take lots of breaks!